the holes at the front of the car are fro japaneese license plate.
you would need a Totsubo Subaru Front License Plate Kit if you were using those holes plenty of threads on nasioc about them and any pitfalls you may encounter.
Other option drilling holes into bumper the same way it is done in most cars, if you don't need a front license plate then you can just use a plate delete.
Front license plate holder for impreza
part number: DCOLICBRKIMP12